Prince Harry and Meghan Markle's wedding cake: Former royal chef says they may 'break tradition' (Exclusive)

Prince Harry and Meghan Markle are currently planning their spring wedding!

The newly engaged couple, who are set to wed in May 2018 at St George's Chapel at Windsor Castle, are in the process of nailing down all the intricate details for their highly anticipated nuptials. ET spoke with former royal chef Darren McGrady on Monday, who shared his predictions on what type of cake the two will choose for their royal wedding.

"This could be the very first time where they break with tradition and don't have a traditional fruitcake," said McGrady, who was the Royal Chef with Queen Elizabeth from 1982 to 1993, and with Princess Diana and Prince William and Harry from 1993 to 1997.

"It wouldn’t surprise me if Meghan chose a traditional American cake -- a layered sponge cake -- and found an American baker in London to make it," he continued, explaining that the bride traditionally chooses the wedding cake flavor. "They wouldn't start planning the cake just yet, but probably making a choice in the next few weeks or so."

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Prince Harry and Meghan Markle engagement photo call
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Prince Harry and Meghan Markle engagement photo call
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Meghan Markle with her engagemnt ring during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Britain's Prince Harry stands with his fianc� US actress Meghan Markle as she shows off her engagement ring whilst they pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
US actress Meghan Markle shows reacts as she poses with her fianc� Britain's Prince Harry in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle arrive to pose for photographs in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry stands with his fianc� US actress Meghan Markle as she shows off her engagement ring whilst they pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Prince Harry and Meghan Markle in the Sunken Garden at Kensington Palace, London, after the announcement of their engagement. (Photo by Dominic Lipinski/PA Images via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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McGrady said that if the two decide to go with a traditional fruitcake, they will be looking for bakers within the next few weeks. It takes about 3-4 months to make the wedding cake, he says, so the bakers would need to start working on it in January in order to be ready for decorating a week before their nuptials.

McGrady tells ET that despite reports that Harry and Markle will have a banana cake, he doesn't believe that to be true -- and Prince Harry's rep tells ET the same. McGrady reveals, however, that Harry and his brother, Prince William, were big fans of banana-flavored desserts growing up. He frequently baked them the Caramel Banana Cake from his book, The Royal Chef at Home: Easy Seasonal Entertaining, which is available now.

Following our interview, McGrady shared his famous recipe with ET. Learn how to make the treat Prince Harry and Prince William would go "bananas" for by following the instructions below:

What you need for the cake:

1 cup plus 1 tbs butter
1 ½ cups light brown sugar
4 eggs
2 cups mashed bananas (about 5 medium)
3 cups self rising flour
2 tsp baking soda
1 ½ cups sour cream
2 tbs milk
2 tsp vanilla paste

What you need for the frosting:

1 ½ cups unsalted butter
2 cups light brown sugar
½ cup sour cream
6 cups powdered sugar
2 tsp vanilla paste

Steps:

1. Preheat the oven to 350 degrees. Grease a ½ sheet pan tray (12 x 18 x 1)
2. Prepare the sponge by creaming the butter and sugar using an electric mixer until light and fluffy.
3. Add the eggs and banana and beat together. Stir in the flour, soda, sour cream, milk and vanilla paste until
there are no lumps and the batter is smooth.
4. Pour into the prepared tray, smooth out and bake in the center of the oven for about 40 minutes or
until the sponge springs back when touched and is a golden brown.
5. Allow the sponge to cool completely before frosting.
6. Prepare the frosting by melting the butter and sugar in a pan. Stir without boiling for about 2
minutes. Add the sour cream, bring to the boil. Remove from the heat and stir in the powdered sugar and
vanilla paste. Leave the frosting to cool slightly and thicken before carefully frosting the sponge.
7. Cut the cake into fingers and serve.

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Celebrity Weddings of 2017
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Celebrity Weddings of 2017
'Dancing with the Stars' alums Peta and Mak tied the knot on July 8: "07~08~2017 was the most ✨magical✨day of my life. I married my soul mate, my perfect man, the only man I could see myself growing old with," she wrote.
How gorgeous was Peta's dress? Truly one of the most beautiful wedding gowns we saw on any celebrity this year.
Erin Andrew made it official with pro hockey player Jarret Stoll in June.
Samira Wiley and Lauren Morelli, who met on set of 'Orange is the New Black,' celebrated their wedding in March with a service in Palm Springs. 
Idina Menzel shared this after her big day: "Wanted to let you know... married the love of my life Aaron Lohr this weekend at our home. Dad & son walked me down the aisle. It was magical. Thank you to everyone who helped make my wedding day so special."
Pippa Middleton married James Matthews at St Mark's Church, Englefield Green on May 20, 2017.
Serena Williams and Alexis Ohanian wed in November in one of the highest-profile celebrity weddings of the year! The "Beauty and the Beast" themed night was nothing short of magical.
"This Is Us" star Justin Hartley looked dapper as ever as he wed Chrishell Stause.
Meghan McCain's father, Senator John McCain, walked her down the aisle during her November ceremony. 
Colton Haynes and Jeff Leatham could hardly contain their joy during their big night -- as none other than Kris Jenner presided over the ceremony!
Patton Oswalt and Meredith Salenger wed in November -- and Patton's daughter, Alice, was a big part of the day!
In what easily may have been the most extravagant wedding of the year, Gucci Mane wed Keyshia Ka’oir in a lavish ceremony fit for royalty.
Kate Upton and Justin Verlander wed just days after Justin, a pitcher for the Houston Astros, won the World Series!
We love Clare Bowen's chic but simple ceremony aesthetic. The 'Nashville' star loves a southern charm vibe! 
Shay Mooney of Dan + Shay wed his lady, Hannah Billingsley, in a lovely ceremony.
Kacey Musgraves couldn't have looked more beautiful as she wed fellow country singer Ruston Kelly in October.
Alicia Vikander and Michael Fassbender tried to evade the paparazzi by having their ceremony in a private area of Ibiza.
Amanda Seyfried and Thomas Sadoski kept photos of their wedding private -- but no doubt it was stunning!
Miranda Kerr and Evan Spiegel kept most of the details under wraps, but they wed in May. They are now expecting their first child. (Kerr has another child from a previous marriage.)
Alison Brie and Dave Franco wed this year after three years together.
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